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Finding the Fourth Proportional to 68.97, 103.46 and 20.88

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Solution

The fourth proportional to 68.97, 103.46 and 20.88 is: 31.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.97 : 103.46 = 20.88 : x
  2. Step 2: Convert to fraction form
    68.97/103.46 = 20.88/x
  3. Step 3: Cross multiply
    68.97x = 103.46 × 20.88
  4. Step 4: Simplify right side
    68.97x = 2,160.24
  5. Step 5: Solve for x
    x = 2,160.24/68.97
  6. Step 6: Final answer
    x = 31.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.